The Discovery of Global Warming

August 2003      [HOME]     List of illustrations     BACK

Variations of oxygen isotopes in the Camp Century ice core (with changes from a smoothed curve set off in black), going back 14,000 years. Higher temperatures to right. (Difference of isotopes in parts per thousand graphed against years Before Present.)
Below: In the ice trench.

Viewing a section of core, 1964. Compare the picture here of the 1989-92 GISP trench.

Graph from Dansgaard et al., chapter 3 of Karl K. Turekian, ed., The Late Cenozoic Glacial Ages,
copyright © Yale University Press, 1971. Photo by David Atwood, U.S. Army-ERDC-CRREL
(Cold Regions Research and Engineering Laboratory),
courtesy Herb Ueda.